Air-pump



C. B. GOODSTEIN.

AIR PU MP.

APPLICATION FILED MAY 6, 1919.

Patented Mar. 30, 1920.

8mm oodstein may.

CHARLES BENJAMEN GOODSTEIN, 0F STRUTHERS, OHIO.

AIR-PUMP.

Specification of Letters Patent. Patented Mar. 30, 1920.

Application filed May 6, 1919. Serial No. 295,036.

To all whom it may concern: 7

Be it known that 1, CHARLES B. Goon- STEIN, a citizen of the United States, and a resident of Struthers, in the county of Mahoning and State of Ohio, have invented certain new and useful Improvements in Air-Pumps, of which the following is a specificatio Y 7 My present invention relates generally to pumps and more particularly to double-acting air pumps, my object being the provision of a simple, inexpensive mechanism which will expel air upon both down and up strokes of the pump plunger, and especially one which is capable of ready repair, eifective operation, and convenient substitution of parts. a 1

WVith the above general statement in mind, my invention resides in the features of construction and arrangement of the operation to be now described with the accompanying drawings, forming a part of this specification, and wherein,

Figure 1 is a side view of my improved pump, partly in elevation and partly broken away in section; and

Fig. 2 is a longitudinal section through one of the valve'membcrs.

Referring now to these figures, the barrel 15 of myimproved pump is cylindrical, as shown, and preferably of the samediameter throughout its length, its lower end being suitably secured in connection with a base plate 16, having laterally oustanding portions 17 forming foot pieces, and its upper end preferably having a threaded cap 18, provided with an axial opening, through which the plunger rod 19 extends.

At the upper outer end of the plunger rod 19 is a handle 20, and at the lower inner end thereof is a reduced threaded portion 21, on which are a series of circular plates 22, supporting between them the washers or leathers 23, the flanged portions of which are turned in opposite directions against the inner surface of the barrel 15. An end nut 24 screwing upon the threaded reduced portion 21 holds the circular plates 22 and leathers 23 in "position, and in practice this nut, upon the down stroke of the plunger, abuts the upper headed end of an abutment pin 25, whose lower end is threaded in connection with the base 16 so as to upstand axially within the lower end of the barrel 15, for a purpose which will be presently described.

Around the plunger rod 19 upon its plunger,1ncluding the parts just above described, is coiled a spring 26, which, upon the upstroke of the plunger, engages the inner surface of the cap 18 at the upper end of this stroke and serves to absorb the shock of such contact as well as an additional purpose presently to be described.

Ad acent to its extreme upper and lower 1 ends the barrel 15 is provided with diametrically opposed openings, the upper and lower openings at one side of the barrel receiving the opposite ends of an air pipe 27 which extends lengthwise along one side of the barrel exteriorly thereof and which is provided at a point intermediate its end with a latterly projecting nipple 28 to which the usual flexible air tube 29 is secured at one end.

The extremities of the air pipe 27, which latter is preferably rigid, like the openings at the opposite side of the barrel are threaded for the reception of valve members, each of which is of the detailed construction shown in Fig. 2, and includes a tapering hollow body, the bore of-which is at its respectively opposite ends larger and smaller in diameter than that of the movable ball 31 shift-able lengthwise therein. Adjacent to its larger end the tapering tubular body 30 has an internal lug 32 which prevents movement of the ball 31 out of the larger end of the body, the latter of which is provided at relatively opposite ends with enlarged cylindrical portions 33 externally threaded thereon to screw into the upper and lower openings at one side of the barrel 15 and into the extremities of the pipe 27 at the opposite side of the barrel.

It is thus obvious that the valve member, as provided by my invention and shown particularly in Fig. 2, is adapted to be mounted by screwing either end of its body into a threaded opening of the member, whatever its nature, which forms its support, in such a manner as to oppose either ingress or egress of air, as the case may be.

Thus the valve members are screwed at one end into the upper and lower extremities of the rigid air pipe 27 to permit of egress of air and to resist ingress, the tapering body portions 30 having their inner ends disposed toward the axis of the pump barrel, while the diametrically opposite valve members are screwed at their opposite ends into the openings of the barrel 15 and disposed with the smaller ends of their bodies 30 outermost and away from the axis of the barrel so as to permit of ingress of air and resist egress of air.

By reference to Fig. 1 it will be noted that the two opposing :valve members at the lower end of the barrel are belowa' the upper end of the abutment pin 25 so that the plunger in its downward movement is thus arrested at such a point as to obviate an injury to the valve members in the use of the pump. It will also be noted that the two upper opening valve members are likewise situated at a point above the limit of upward movement of the plunger arrested at the upper ends of its up stroke by the engagement of the spring 26 coiled around the plunger rod with the cap 18.

In practice, with the plunger in the low ermost position as seen in Fig. 1, air previously taken into the space within the barrel above the plunger through the upper right-hand air intake valve, is expelled through the upper left-hand air outlet valve,

when the handle 20 is 'asped and the plunger shifted upwardly in. the barrel, an being at the same time taken into! the space below the plunger through the lower righthand air intake valve for subsequent expulsion through the left-hand air outlet valve when the plunger is again forced downwardly.

In each instance during the intake of air either above or below the plunger, the left-hand air outlet valve automatically closes as its ball 31 is drawn snugly into the smaller end'of its body 30, and each instance upon the expulsion of air the respective air outlet valve opens as its opposing inlet valve closes, in order to provide for the expulsion oi air into the connecting pipe 27. In this way air is expelled during both the up and down stroke of the plunger and forced into the air tube 29 through the connection of the latter with the ridged pipe 27.

At the same time it will be observed that by virtue of the particular construction and connection of the several valve members within the pump barrel, as well as the con nection of the latter with the base '16 and the cap 18, providing for removal of these latter parts, any one or all of the valve members may be readily removed for purpose of repair or substitution thereof, and my invention has therefore the important advantage in a device of this nature of simplicity, economy, ready upkeep, and convenient repair and substitution of parts.

I claim:

1. An air pump including reversible air valves,each consisting oi a tubular tapering body portion having enlarged cylindrical extensions at its opposite ends, said extensions being of the same diameter and having external threads to adapt the body for connection at either end within a receiving bore, a ball shiftable within the body portionand ota diameter greater than that of the bore of the body at its smaller end, said body having inward projections adjacent to its enlarged end adapted to prevent move ment of the ball out of the body portion as described.

2. An air pump including reversible air controlled valves, each consisting of a tubular tapering body portion having threaded cylindrical extensions of the s: me diameters at its opposite ends, a ball shiftable within the body portion and of a diameter greater than that of the bore of the body at its smaller end, said body portion of the valve having internally projecting means adjacent to its larger end to prevent movement of the ball out of the body portion, as described.

CHARLES BENJAMEN GOODSTEIE. 

